Definition(s)
Burnback
Internal burning within the flare tip. NOTE Burnback can result from air backing down the flare burner at purge or low flaring rates.
Source: API STD 521, Pressure-relieving and Depressuring Systems, Sixth Edition, January 2014. Global Standards
Source: API STD 521, Pressure-relieving and Depressuring Systems, Fifth Edition, January 2007 (Addendum May 2008). Global Standards